DB<38> @b=1..3
  
  DB<39> x @b[0..6]
0  1
1  2
2  3
3  undef
4  undef
5  undef
6  undef
  DB<40> x (@b)[0..6]
0  1
1  2
2  3
3  undef
4  undef
5  undef
6  undef